The statement said a review of the incident concluded Kent Police were correct in both the handling and outcome of the incident, but Mr Ferris had not been kept properly informed of progress.

BBC: Kent Police 'correct to release Bearsted intruder'

The chief told the Globe that he was comfortable with the way his commanders were handling the incident.

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Mr Mitchell also criticised Number 10's handling of the situation in the days following the incident.

BBC: Andrew Mitchell

The arrangement will see the BP chartered anchor handling vessel "Grampian Frontier" being drafted in to help in the event of a marine pollution incident.

BBC: BP agrees to emergency tug deal